Reimplements the handoff Shell in React/TS: 208px left rail (nav +
connection dot + Evening service theme switch), max-1120 main column,
330px Reginald chat panel. Routing across top-level views with an
issue drill-in + back-stack of one; data-theme owned by the shell.
- ChatPanel: fixture write-path — echoes a canned reply so layout +
interactions are real; model router wiring lands in P4.
- states.tsx: EmptyState / OfflineBanner / ModelAwayState + the States
specimen gallery, ported from the handoff.
- PlaceholderScreen stands in for not-yet-built views (P3-3+), keeping
navigation live; it also exposes the issue drill-in for now.
- Gallery loses its own theme toggle (shell owns data-theme); reachable
via a Primitives rail entry as a living reference.
Fixtures mirrored from the handoff's data.js. typecheck + 7 e2e green
(nav, theme, offline banner + disabled composer, chat echo, drill-in
back-stack); light/dark/states screenshots verified.
Closes P3-2.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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